Question

I want to load up a random image while a page it is loading but not sure what the syntax is for either asp:image or just img.

The files are all named the same but with a number at the end so I could do:

string Get_RandomImage()
{
   Random random = new Random();
   return "~/images/image" + random.Next(1, 23) + ".jpg";
}

But the image is within <ProgressTemplate> so I cant just go image.ImageURL = something in the code behind.

How can I call the random method where I am declaring the asp:Image on the aspx page?

ImageURL='<%#Get_RandomImage()%>'

does not work.

Answer 1

First at all you need to initialize random variable outside of the Get_RandomImage method, make it static and change that method accessibility level to protected. Also you can use such expression ImageURL='<%#Get_RandomImage()%> only if you call DataBind on page or image’s parent control.

<asp:UpdateProgress runat="server" >
     <ProgressTemplate>
          <asp:UpdatePanel runat="server" UpdateMode="Always" >
               <ContentTemplate>
                    <%--Put your image here--%>
                    <%= DateTime.Now %>
               </ContentTemplate>
          </asp:UpdatePanel>
     </ProgressTemplate>
</asp:UpdateProgress>